NATS 1940 Lecture Notes - Lecture 7: Gamete, Allele, Antirrhinum

• School: York University
• Department: Natural Science
• Course: NATS 1940
• Professor: Mark Vicari

Document Summary

Medel"s ne(cid:454)t questio(cid:374): how are pairs of genes inherited, each pea plant has two alleles for every character, ex, ppyyrr et(cid:272) Seed color seed shape: each gamete has one allele per character, e. g. pyr et(cid:272). Hypothesis: dominant and recessive alleles stay together in gametes. Ppyy py and py gametes only: dominant and recessive alleles segregate independently. Ppyy py, py, py, py gametes possible py. Ppyy ppyy ppyy: 9 that start with. P and y: 3 that start with. P and 2 small y: 3 that has 2 small p and at least 1 big y, 1 that has 2 small p and 2 small y. Me(cid:374)del"s e(cid:272)o(cid:374)d law (cid:894)law of i(cid:374)depe(cid:374)de(cid:374)t assort(cid:373)e(cid:374)t(cid:895: each pair of alleles segregated independently of other pairs of alleles during gamete formation, note: we (cid:374)ow k(cid:374)ow the (cid:862)law(cid:863) does (cid:374)ot appl(cid:455) i(cid:374) all situatio(cid:374)s! Recall: in pea plants, purple flowers (p) are dominant over white (p) yellow seeds (y) are dominant over green (y)